Drill-brace



UNITED STATES P TENT .rricii.

' ENOS B. PETRIE, OF BUFFALO, NEW YORK.

DRlLL-BRACE.

SPECIFICATION forming part of Letters Patent No. 543,267, dated July 23,1895. Application filed September 15, 1894. Serial No.523,115 (l lomodel.)

To all whom iv may concern:

Be it known that I, ENos'B. PETRIE, a citizen of the United States,residing at Buifalo, In the county of Erie and State of New York, haveinvented anew and useful Improvement in Drill-Braces, of which thefollowing is a specification.

This invention relates to a drill-brace designed more particularly foruse in connection with a ratchet or hand-drill forboring rivet or boltholes in railroad-rails and in structural iron or steel, such as beams.

My invention has the object to provide an inexpensive implement of thischaracter which is readily applied to a rail or other part to bedrilled, and whereby the drill may be conveniently fed forward as thework progresses.

In the accompanying drawings, Figure l is a top plan view of my improveddrill-brace, partly in section, showing its application to a rail. Fig.2 is a fragmentary longitudinal section of the brace on an enlargedscale. Figs. 3 and 4 are cross-sections thereof in lines 3 3 and 4 4:,Fig. 2. Fig. 5 is an elevation of the drill-brace,showing another methodof applying the same to a rail.

Like letters of reference refer to like parts in the several. figures.

A'is a stationary feed-screw or externally screw-threaded stem havingatone end a foot or flange a. When the deviceis applied toa rail or beamwhich already has one or more holes and in which it is desired to drillan additional hole orholes, the foot of the feedscrew is placed againstthe side of the rail or beam and temporarily secured thereto by a bolt1), passing through one of the holes of the rail or beam and an openingformed in the foot, as shown in Fig. 1. When the device is applied to arail having no holes for the passage of a fasteningbolt, the feed-screwmay be placed under the rail, with its footbearing against the side ofthe rail opposite that on which the-drill is arranged, as shown in Fig.5.

' C is a head or disk arranged to slide lengthwiseon the feed-screw A,but held againstrotation thereon. For this purpose the feedscrew isflattened on-opposite sides, as shown in Figs. 3 and 4, and the openingof the disk which receives the screw is correspondingly flattened. Theconcentric portions of the rotary movement of the collar.

disk-opening between its flattened portions are of sufficiently largerradius than the feedscrew to clear the threads of the latter, so as toallow the disk to slide freely on the screw toward and from the foot'a.

Dis a'ring or collar surrounding the disk O and carrying alaterally-extending brace or arm E, which receives the thrust of thedrill F. This brace-arm is formed on or secured to one side of the ringD, and the latter is preferably capable of circumferential adjustment onthe sliding disk 0, so thatthe bracearm may be turned on the disk forbringing it oppositethe place, on the rail or beam where a hole is to bedrilled.

. The ring D may be adjustably secured to the disk by a thumb-screw g,arranged in a threaded radial opening formed in the ring and bearingagainst the face of the disk, or by any other suitable means.

The drill F may be of any ordinary construction, and the rear end of itsspindle bears against the face of the brace-arm E.

H is a rotary feed-collar or screw-nut which traverses the feed-screw A,and whereby the sliding disk which carries the brace-arm is moved towardand from the rail or other part to which the drill-brace is applied.This feedcollar engages with the sectional screwthreads of thefeed-screw and may be provided with a hand-wheel h or other suitablemeans for turning it. The disk' 0 is connected with the feed-collar by acoupling which compels the disk to move longitudinally on the feed-screwwith the feed-collar, and at the same time permits the necessary In theconstructionshown in the drawings the disk is connected with thefeed-collar by keys I, passing through the bores of the disk and thefeed-collar, and each provided at its outer end with anoutwardly-projecting lip i, which overlaps the adjacent edge of thefeedcollar, and at its opposite end with a similar lip'z", whichoverlaps the inner side of the disk and its surrounding ring D. The bodyportions of these keys slide in longitudinal grooves j, formed inopposite sides of the too feed-screw.

To reduce the friction between the feedcollar and the sliding disk, aball-bearing is interposed between these parts, as shown, the y partsbeing formed in their opposing faces with annular grooves, in which theballs is run.

In the use of my improved drill-brace,after applying the feed-screw tothe work, the disk or head which carries the brace-arm is advanced onthe feed-screw by the forward rotation of the feed-collar until thebrace-arm bears against the rear end of the drill-spindle. As the boringprogresses the brace-arm is gradually fed forward by turning thefeedcollar, whereby the carrying-disk is advanced on the screw.

The requisite pressure of the drill against the work is thus exertedwithout any special effort on the part of the operator, it being onlynecessary to give the feed-collar a slight forward turn from time totime until the hole is bored. After completing the operation thebrace-arm is readily returned to its former position, preparatory todrilling another hole, by turning the feed-collar backward.

I claim as my invention- 1. The combination with a feed screw, of anon-rotary head or disk capable of longitudinal movement on said feedscrew and carrying a brace arm, a rotary feed collar engaging with saidfeed screw, and a coupling connecting said head or disk with said feedcollar, substantially as set forth.

2. The combination with a feed screw or externally threaded stem, of anon-rotary head or disk capable of sliding lengthwise on said screw orstem and carrying a laterally extending brace-arm, a feed collarengaging with said feed screw, whereby said carrying head or disk ismoved on the feed screw, and a ball bearing interposed between the feedcollar and said head or disk, substantially as set forth.

3. The combination with a fiat-sided screw stem, of a disk or headcapable of longitudinal movement on said stem and having a fiatsidedbore, a brace arm arranged on said head or disk, and a rotary feedcollar or nut engaging with said screw stem and connected with said heador disk, substantially as set forth.

4:. The combination with a screw-stem provided with a longitudinalgroove, of a head or disk sliding on said screw stem and carrying abrace-arm, a rotary feed collar or'nut engaging with said screw stem,and a connecting key arranged in the groove of the screw stem and havinglips which overlap the feed collar and said head or disk, substantiallyas set forth.

5. The combination with a supportiugstem,

of a non-rotary head or disk capable of lon- 'gitudinal movement on saidstem, a ring or collar capable of circumferential adjustment on saidhead or disk and carryinga brace arm, and a feed device for moving thehead or disk on said stem, substantially as set forth.

Witness my hand this 6th day of September, 1894:.

ENOS B. PETRIE.

Witnesses:

CARL F. GEYER, ELLA R. DEAN.

